Image Processing Reference
In-Depth Information
Polygon
mirror
Fast scan
Slow scan
Optics
Scan line
Laser
Belt rotation
Fast scan
Photoreceptor
drum
Slow scan
(a)
(b)
Belt rotation
FIGURE 10.37
(a) ROS imager and (b) schematic for the raster scanning scheme.
intensity values. Let this matrix be denoted as g(n). Note that the matrix is only one-
dimemsional (1-D), that is, a vector. Due to the raster scanning nature of the laser, we
need to differentiate between the fast-scan and slow-scan directions, which means
obtaining the ROS intensity pro
le is not exactly the same as convolving halftoned
image with a two-dimensional (2-D) Gaussian or sinc
2
filter. The step-by-step
approach involved in modeling this process is captured in Figure 10.39 and described
with a simple example below.
Sinc
2
profile
9
8
7
6
5
4
3
2
1
-150
-100
-50
0
34
Microns
50
100
150
(a)
(a) Sinc
2
function beam profile.
FIGURE 10.38
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